Spam-Introduction

                Simply, "spam" is any unwanted e-mail, generally commercial in nature. You can always recognize it from the strange, illogical, and sometimes-absurd subject lines. They will offer items at a price that's too good to be true, items that have no use, or services that are illegal in nature.

               E-mail spam, also known as junk e-mail, is a subset of spam that involves nearly identical messages sent to numerous recipients by e-mail. A common synonym for spam is unsolicited bulk e-mail (UBE). Definitions of spam usually include the aspects that email is unsolicited and sent in bulk."UCE" refers specifically to unsolicited commercial e-mail.

                From the beginning of the Internet (the ARPANET), sending of junk e-mail has been prohibited,enforced by the Terms of Service/Acceptable Use Policy (ToS/AUP) of internet service providers (ISPs) and peer pressure. Even with a thousand users junk e-mail for advertising is not tenable, and with a million users it is not only impractical, but also expensive. It is estimated that spam cost businesses on the order of $100 billion in 2007. As the scale of the spam problem has grown, ISPs and the public have turned to government for relief from spam, which has failed to materialize.